CN112194393B - Preparation method of portland cement - Google Patents

Preparation method of portland cement Download PDF

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Publication number
CN112194393B
CN112194393B CN202010947488.4A CN202010947488A CN112194393B CN 112194393 B CN112194393 B CN 112194393B CN 202010947488 A CN202010947488 A CN 202010947488A CN 112194393 B CN112194393 B CN 112194393B
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bauxite
silica sand
portland cement
gypsum
weight ratio
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CN112194393A (en
Inventor
樊文军
杨彦峰
王亮
刘永明
陈永林
王杨
闫永越
邬乐
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Inner Mongolia Yili Jidong Cement Co ltd
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Inner Mongolia Yili Jidong Cement Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/02—Portland cement
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

Abstract

The invention relates to the technical field of gasification slag utilization, and discloses a preparation method of portland cement. The method comprises the following steps: (1) drying mirabilite ore, silica sand and bauxite at 50-80 ℃; (2) mixing mirabilite ore, silica sand, bauxite and gasified slag, grinding the mixture into powder, and screening the powder by using a 50-80-mesh screen, wherein the weight ratio of the mirabilite ore to the silica sand to the bauxite to the gasified slag is 0.5-1.5:3-10:2-5: 10; (3) calcining at 1000-1100 deg.C for 3-5 hr, calcining at 1200-1300 deg.C for 0.5-1 hr, and cooling; (4) mixing the calcined mixture with silicate cement clinker and gypsum, and grinding to specific surface area of more than 400m2And/kg, wherein the weight ratio of the calcined mixture to the portland cement clinker to the gypsum is 1-3:2-4: 1. The Portland cement prepared by the invention has higher compressive strength and flexural strength.

Description

Preparation method of portland cement
Technical Field
The invention relates to the technical field of gasification slag utilization, in particular to a preparation method of portland cement.
Background
With the rapid development of industrial economy in China, the coal chemical industry mainly synthesizing and preparing various chemical products and fuel oil is rapidly developed based on the structural characteristics of primary energy of 'rich coal, lean oil and little gas' in China. The coal contains more unburnt coal, and the direct stockpiling and discharging not only occupies a large amount of land and causes risks of environmental pollution and geological disasters, but also causes waste of coal resources. The coal gasification ash slag is used as a roadbed, a mine, and the like, besides being buried or stacked in the open air, the coal gasification ash slag is used as a cement raw material, and other applications such as a ceramic raw material have small mixing amount and limited processing capacity, so that the coal gasification ash slag which grows at a high speed cannot be sufficiently consumed.
Disclosure of Invention
The invention aims to overcome the problems of limited treatment capacity and insufficient consumption of a large amount of gasified slag which grows at a high speed in the prior art, and provides a method for preparing portland cement.
In order to achieve the above object, according to one aspect of the present invention, there is provided a method for preparing portland cement, comprising the steps of:
(1) drying mirabilite ore, silica sand and bauxite at 50-80 ℃, wherein Na in the mirabilite ore is obtained after calcination at the temperature of 1000-1300 DEG C2SO4Is not less than 25 wt%, SiO in the silica sand2Is not less than 60 wt%, Al in the bauxite2O3Not less than 99 wt%;
(2) mixing dried mirabilite, silica sand, bauxite and gasified slag, grinding the mixture, and screening the mixture by a 50-80-mesh screen to obtain mixed powder, wherein the weight ratio of the mirabilite to the silica sand to the bauxite to the gasified slag is 0.5-1.5:3-10:2-5:10, and the gasified slag contains 30-65 wt% of SiO215-30% by weight of Al2O310-20% by weight of Fe2O36-12 wt% of CaO, 4-8 wt% of MgO;
(3) calcining the mixed powder at the temperature of 1000-1100 ℃ for 3-5 hours, then calcining at the temperature of 1200-1300 ℃ for 0.5-1 hour, and cooling to obtain a calcined mixture;
(4) mixing the calcined mixture with silicate cement clinker and gypsum, and grinding to specific surface area of more than 400m2And/kg, obtaining the Portland cement, wherein the weight ratio of the calcined mixture to the Portland cement clinker to the gypsum is 1-3:2-4: 1.
Preferably, in the step (1), the mirabilite ore, the silica sand and the bauxite are dried at 60-70 ℃.
Preferably, after calcination at 1000 ℃, Na in the mirabilite ore2SO4The content of (A) is 25-35 wt%, and SiO in the silica sand2In an amount of 60 to 80 wt.%, and Al in the bauxite2O3The content of (B) is 99-99.5 wt%.
Preferably, in step (2), the screened oversize is no more than 8%.
Preferably, in step (2), the weight ratio of silica sand to bauxite is 1-4: 1.
Preferably, in the step (3), the mixed powder is calcined at 1020-1050 ℃ for 3.5-4 hours.
Preferably, in the step (3), the cooling mode is natural cooling in air.
Preferably, in step (4), the gypsum is dihydrate gypsum.
Preferably, in the step (4), the calcined mixture is mixed with the portland cement clinker and gypsum and ground to a specific surface area of 450-2/kg。
In another aspect of the present invention there is provided a portland cement produced by the method described above.
The method of the invention takes the gasified slag as the raw material to prepare the portland cement, not only can effectively consume the gasified slag and reduce the environmental pollution, but also can convert the gasified slag into useful cement materials at low cost, and has good economic and social benefits. Meanwhile, the Portland cement prepared by the invention has higher compressive strength and flexural strength and better mechanical property.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The preparation method of the Portland cement comprises the following steps:
(1) drying mirabilite ore, silica sand and bauxite at 50-80 ℃, wherein Na in the mirabilite ore is obtained after calcination at the temperature of 1000-1300 DEG C2SO4Is not less than 25 wt%, SiO in the silica sand2Is not less than 60 wt%, Al in the bauxite2O3Not less than 99 wt%;
(2) mixing dried mirabilite, silica sand, bauxite and gasified slag, grinding the mixture, and screening the mixture by a 50-80-mesh screen to obtain mixed powder, wherein the weight ratio of the mirabilite to the silica sand to the bauxite to the gasified slag is 0.5-1.5:3-10:2-5:10, and the gasified slag contains 30-65 wt% of SiO215-30% by weight of Al2O310-20% by weight of Fe2O36-12 wt% of CaO, 4-8 wt% of MgO;
(3) calcining the mixed powder at the temperature of 1000-1100 ℃ for 3-5 hours, then calcining at the temperature of 1200-1300 ℃ for 0.5-1 hour, and cooling to obtain a calcined mixture;
(4) mixing the calcined mixture with silicate cement clinker and gypsum, and grinding to specific surface area of more than 400m2And/kg, obtaining the Portland cement, wherein the weight ratio of the calcined mixture to the Portland cement clinker to the gypsum is 1-3:2-4: 1.
In a specific embodiment, in the step (1), the mirabilite ore, the silica sand, and the bauxite may be dried at 50 ℃, 55 ℃, 60 ℃, 65 ℃, 70 ℃, 75 ℃, or 80 ℃.
In a preferred embodiment, in step (1), the mirabilite ore, the silica sand and the bauxite are dried at 60-70 ℃.
In another preferred embodiment, in step (1), after calcination at 1000 ℃, Na is contained in the mirabilite ore2SO4The content of (A) is 25-35 wt%, and SiO in the silica sand2In an amount of 60 to 80 wt.%, and Al in the bauxite2O3The content of (B) is 99-99.5 wt%.
In the method of the present invention, in the step (2), the dried mirabilite ore, silica sand, bauxite and gasified slag may be ground and sieved through a 50-mesh, 55-mesh, 60-mesh, 65-mesh, 70-mesh, 75-mesh or 80-mesh screen.
In the method of the invention, in the step (2), the screened screen allowance is not more than 8%; preferably, the screened oversize is no more than 7%; more preferably, the screened oversize is no more than 5%.
In the method of the invention, in the step (2), the weight ratio of the silica sand to the bauxite is 1-4: 1; specifically, for example, it may be 1:1, 2:1, 3:1, 4:1, or any value in a range formed by any two of these point values; preferably, in step (2), the weight ratio of silica sand to bauxite is 2-3: 1.
In the method of the present invention, in the step (3), the mixed powder may be calcined at 1000 ℃, 1020 ℃, 1040 ℃, 1060 ℃, 1080 ℃ or 1000 ℃ for 3 hours, 3.5 hours, 4 hours, 4.5 hours or 5 hours.
Preferably, in the step (3), the mixed powder is calcined at 1020-1050 ℃ for 3.5-4 hours.
In the process of the present invention, in step (3), the manner of cooling may be a routine choice in the art. Preferably, the cooling is performed by natural cooling in air.
In the process of the present invention, in step (4), the gypsum may be a conventional choice in the art, and may be, for example, anhydrous gypsum, hemihydrate gypsum or dihydrate gypsum. Preferably, the gypsum is dihydrate gypsum.
In the method of the present invention, the calcined mixture, the portland cement clinker and the gypsum are ground to a specific surface area of more than 400m2Per kg; preferably, the calcined mixture is ground with portland cement clinker and gypsum to a specific surface area of more than 420m2Per kg; more preferably, in the step (4), the calcined mixture is mixed with the portland cement clinker and gypsum and ground to a specific surface area of 450-2/kg。
In another aspect of the present invention there is provided a portland cement produced by the method described above. The Portland cement has high compressive strength and rupture strength and good mechanical properties.
The present invention will be described in detail by way of examples, but the scope of the present invention is not limited thereto.
The examples of the present invention and comparative examples are for illustrating the preparation process of portland cement.
Example 1
The preparation process comprises the following steps:
(1) drying mirabilite ore, silica sand and bauxite at 60 ℃, wherein Na in the mirabilite ore is obtained after calcination at the temperature of 1000-1300 DEG C2SO4Is not less than 25 wt%, SiO in the silica sand2Is not less than 60 wt%, Al in the bauxite2O3Not less than 99 wt%;
(2) mixing the dried mirabilite ore, silica sand, bauxite and gasified slag, grinding the mixture, screening the mixture by a 65-mesh screen with the screen allowance not more than 8 percent, wherein the weight ratio of the mirabilite ore to the silica sand to the bauxite to the gasified slag is 1:6.5:3:10, and obtaining mixed powder, wherein the gasified slag contains 48 weight percent of SiO225% by weight of Al2O310% by weight of Fe2O312% by weight of CaO, 5% by weight of MgO;
(3) calcining the mixed powder at 1050 ℃ for 3 hours, then calcining at 1300 ℃ for 1 hour, and carrying out self-heating cooling in the air to obtain a calcined mixture;
(4) mixing the calcined mixture with the silicate cement clinker and the gypsum, and grinding the mixture until the specific surface area is 420-500m2And/kg, obtaining the Portland cement, wherein the weight ratio of the calcined mixture to the Portland cement clinker to the gypsum is 2:4: 1.
Example 2
(1) Drying mirabilite ore, silica sand and bauxite at 50 ℃, wherein Na in the mirabilite ore is obtained after calcination at the temperature of 1000-1300 DEG C2SO4Is not less than 28 wt%, and SiO in the silica sand2Not less than 65 wt%, Al in the bauxite2O3Not less than 99.3 wt%;
(2) mixing dried mirabilite ore, silica sand, bauxite and gasified slag, sieving by a 80-mesh sieve after grinding, wherein the sieve residue is not more than 5%, wherein the weight ratio of the mirabilite ore, the silica sand, the bauxite and the gasified slag is 0.5:10:5:10, and mixed powder is obtained, wherein the gasified slag contains 60 wt% of SiO215% by weight of Al2O312% by weight of Fe2O36% by weight of CaO, 7% by weight of MgO;
(3) calcining the mixed powder at 1000 ℃ for 4 hours, then calcining at 1250 ℃ for 0.5 hour, and carrying out self-heating cooling in air to obtain a calcined mixture;
(4) mixing the calcined mixture with the silicate cement clinker and the gypsum, and grinding the mixture until the specific surface area is 450-550m2And/kg, obtaining the Portland cement, wherein the weight ratio of the calcined mixture to the Portland cement clinker to the gypsum is 3:2: 1.
Example 3
(1) Drying mirabilite ore, silica sand and bauxite at 80 ℃, wherein Na in the mirabilite ore is obtained after calcination at 1000-1300 DEG C2SO4Is not less than 26 wt%, and SiO in the silica sand2Not less than 63 wt%, Al in the bauxite2O3In an amount of not less than 99.5 wt％；
(2) Mixing the dried mirabilite ore, silica sand, bauxite and gasified slag, sieving by a 50-mesh sieve after grinding, wherein the sieve residue is not more than 5%, wherein the weight ratio of the mirabilite ore, the silica sand, the bauxite and the gasified slag is 1.5:3:2:10, and obtaining mixed powder, wherein the gasified slag contains 30 wt% of SiO230% by weight of Al2O320% by weight of Fe2O312% by weight of CaO, 8% by weight of MgO;
(3) calcining the mixed powder at 1100 ℃ for 5 hours, then calcining at 1200 ℃ for 1 hour, and carrying out self-heating cooling in the air to obtain a calcined mixture;
(4) mixing the calcined mixture with the silicate cement clinker and the gypsum, and grinding the mixture until the specific surface area is 500-600m2And/kg, obtaining the Portland cement, wherein the weight ratio of the calcined mixture to the Portland cement clinker to the gypsum is 1:3: 1.
Example 4
The procedure of example 1 was followed except that, in the step (1), mirabilite ore, silica sand, and bauxite were dried at 70 ℃.
Example 5
The process is carried out according to example 1, except that in step (2), the dried mirabilite, silica sand, bauxite and gasified slag are ground and sieved by a 75-mesh sieve.
Example 6
The process of example 1 was followed except that in step (2), the weight ratio of mirabilite, silica sand, bauxite, and gasified slag was 1.2:5:4: 10.
Example 7
The procedure of example 1 was followed, except that, in step (3), the mixed powder was calcined at 1020 ℃ for 3.5 hours and then at 1300 ℃ for 1 hour.
Example 8
The procedure of example 1 was followed, except that, in step (3), the mixed powder was calcined at 1050 ℃ for 3 hours and then at 1280 ℃ for 1 hour.
Example 9
The process of example 1 was carried out, except that, in the step (4), the calcined mixture was mixed with portland cement clinker and gypsum and ground to a specific surface area of 600-700m2/kg。
Example 10
The process of example 1 was followed except that in step (4), the weight ratio between the calcined mixture, the portland cement clinker and the gypsum was 2.5:2.5: 1.
Comparative example 1
The procedure of example 1 was followed, except that, in the step (1), mirabilite ore, silica sand, and bauxite were dried at 100 ℃.
Comparative example 2
The process is carried out according to example 1, except that in step (2), the dried mirabilite, silica sand, bauxite and gasified slag are ground and sieved by a 40-mesh sieve.
Comparative example 3
The process of example 1 was followed except that in step (2), the weight ratio of mirabilite, silica sand, bauxite, and gasified slag was 2:6.5:3: 10.
Comparative example 4
The procedure of example 1 was followed, except that, in step (3), the mixed powder was calcined at 900 ℃ for 3 hours and then at 1300 ℃ for 1 hour.
Comparative example 5
The procedure of example 1 was followed, except that, in step (3), the mixed powder was calcined at 1050 ℃ for 3 hours and then at 1100 ℃ for 1 hour.
Comparative example 6
The process of example 1 was carried out, except that, in the step (4), the calcined mixture was mixed with the portland cement clinker and gypsum and ground to a specific surface area of 300-350m2/kg。
Comparative example 7
The process of example 1 was followed except that in step (4), the weight ratio between the calcined mixture, the portland cement clinker and the gypsum was 4:4: 1.
Test example
The strength properties of the portland cements prepared in examples 1-10 and comparative examples 1-7 were determined according to the GB/T17671-1999 standard, and the test results are shown in Table 1.
TABLE 1
Figure BDA0002675793880000091
Figure BDA0002675793880000101
As can be seen from the results in Table 1, the Portland cement prepared by the method of the invention has high compressive strength and flexural strength and good mechanical properties.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.

Claims (10)

1. A method for preparing portland cement, comprising the following steps:
(1) drying mirabilite ore, silica sand and bauxite at 50-80 ℃, wherein Na in the mirabilite ore is obtained after calcination at the temperature of 1000-1300 DEG C2SO4Is not less than 25 wt%, SiO in the silica sand2Is not less than 60 wt%, Al in the bauxite2O3Not less than 99 wt%;
(2) mixing dried Natrii sulfas, silica sand, bauxite and gasified residue, grinding, sieving with 50-80 mesh sieve, wherein Natrii sulfas, silica sand, bauxite and gasified residueThe weight ratio is 0.5-1.5:3-10:2-5:10, and mixed powder is obtained, wherein the coal gasification slag contains 30-65 wt% of SiO215-30% by weight of Al2O310-20% by weight of Fe2O36-12 wt% of CaO, 4-8 wt% of MgO;
(3) calcining the mixed powder at the temperature of 1000-1100 ℃ for 3-5 hours, then calcining at the temperature of 1200-1300 ℃ for 0.5-1 hour, and cooling to obtain a calcined mixture;
(4) mixing the calcined mixture with silicate cement clinker and gypsum, and grinding to specific surface area of more than 400m2And/kg, obtaining the Portland cement, wherein the weight ratio of the calcined mixture to the Portland cement clinker to the gypsum is 1-3:2-4: 1.
2. The method according to claim 1, wherein in the step (1), the mirabilite ore, the silica sand and the bauxite are dried at 60 to 70 ℃.
3. The method according to claim 1, wherein in step (1), after calcination at 1000 ℃, Na is contained in the mirabilite ore2SO4The content of (A) is 25-35 wt%, and SiO in the silica sand2In an amount of 60 to 80 wt.%, and Al in the bauxite2O3The content of (B) is 99-99.5 wt%.
4. The method of claim 1, wherein in step (2), the screened oversize is no more than 8%.
5. The method according to claim 1, wherein in step (2), the weight ratio of silica sand to bauxite is 1-4: 1.
6. The method as claimed in claim 1, wherein in step (3), the mixed powder is calcined at 1050 ℃ for 3.5-4 hours at 1020 ℃.
7. The method of claim 1, wherein in step (3), the cooling is performed by natural cooling in air.
8. The method of claim 1, wherein in step (4), the gypsum is dihydrate gypsum.
9. The method as claimed in claim 1, wherein in the step (4), the calcined mixture is mixed with the portland cement clinker and gypsum and ground to a specific surface area of 450-2/kg。
10. A portland cement produced by the method of any one of claims 1-9.
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CN108178536A (en) * 2018-03-09 2018-06-19 湖南科技大学 A kind of method that step calcination coal gas slugging prepares cement with little clinker
CN108191270A (en) * 2018-03-09 2018-06-22 湖南科技大学 A kind of method that suspension roasting coal gas slugging prepares cement with little clinker
CN108249791A (en) * 2018-03-09 2018-07-06 湖南科技大学 A kind of method that cheap sodium salt of step calcination prepares cement with little clinker
CN108275895A (en) * 2018-03-09 2018-07-13 湖南科技大学 A kind of method that the slugging of suspension roasting coal gas prepares cementitious material
CN108358478A (en) * 2018-03-09 2018-08-03 湖南科技大学 A kind of method that the slugging of step calcination coal gas prepares cementitious material
CN108889771A (en) * 2018-07-30 2018-11-27 河南心连心化肥有限公司 A kind of coal ash comprehensive utilization of slag device and method of comprehensive utilization
CN208894845U (en) * 2018-07-30 2019-05-24 河南心连心化肥有限公司 A kind of coal ash comprehensive utilization of slag device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108178536A (en) * 2018-03-09 2018-06-19 湖南科技大学 A kind of method that step calcination coal gas slugging prepares cement with little clinker
CN108191270A (en) * 2018-03-09 2018-06-22 湖南科技大学 A kind of method that suspension roasting coal gas slugging prepares cement with little clinker
CN108249791A (en) * 2018-03-09 2018-07-06 湖南科技大学 A kind of method that cheap sodium salt of step calcination prepares cement with little clinker
CN108275895A (en) * 2018-03-09 2018-07-13 湖南科技大学 A kind of method that the slugging of suspension roasting coal gas prepares cementitious material
CN108358478A (en) * 2018-03-09 2018-08-03 湖南科技大学 A kind of method that the slugging of step calcination coal gas prepares cementitious material
CN108889771A (en) * 2018-07-30 2018-11-27 河南心连心化肥有限公司 A kind of coal ash comprehensive utilization of slag device and method of comprehensive utilization
CN208894845U (en) * 2018-07-30 2019-05-24 河南心连心化肥有限公司 A kind of coal ash comprehensive utilization of slag device

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